EP1385725A1 - Vorgesteuertes ventil mit einem backupventil - Google Patents
Vorgesteuertes ventil mit einem backupventilInfo
- Publication number
- EP1385725A1 EP1385725A1 EP02748677A EP02748677A EP1385725A1 EP 1385725 A1 EP1385725 A1 EP 1385725A1 EP 02748677 A EP02748677 A EP 02748677A EP 02748677 A EP02748677 A EP 02748677A EP 1385725 A1 EP1385725 A1 EP 1385725A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- pilot
- control
- backup
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000013022 venting Methods 0.000 claims 3
- 238000001746 injection moulding Methods 0.000 claims 1
- 238000009423 ventilation Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
- B60T8/361—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force wherein the pilot valve is mounted in a circuit controlling an auxiliary fluid system
Definitions
- the invention relates to a pilot-operated valve, in particular an electro-pneumatic control valve for a compressed air brake system of a vehicle, with a relay valve housing in which an axially adjustable control piston for actuating a valve seat arrangement switching the compressed air flow between at least one external brake line connection, a supply pressure connection and a ventilation connection is arranged.
- the control piston being movable for axial adjustment via an electromagnetic pilot valve arrangement consisting of at least one outlet valve, an inlet valve and a backup valve, which are housed together in a pilot valve housing connected to the relay valve housing.
- the present invention is concerned with a special configuration of the channel guide on the backup valve.
- a pilot-operated valve designed as an electropneumatic control valve is used within a compressed air brake system of a vehicle in order to regulate a brake pressure in accordance with the desired braking effect —which can be predetermined by a foot brake pedal.
- a brake line extending from the control valve is usually connected to a brake cylinder, which in turn generates the braking force required to brake the vehicle and forwards it to a disc or drum brake that is operatively connected to it.
- the pressure setpoint for the electropneumatic control valve can be specified both electrically and pneumatically. However, the pneumatic control is only used for safety in the event of a failure of the electrical control - for example as a result of a power failure.
- An electropneumatic control valve is known from DE 196 05 562 A1, which has a two-part metallic housing which consists of a lower relay valve housing and an upper pilot valve housing screwed to it. stands.
- a brake line connection, a feed pressure connection and a bleed connection are located on the lower relay valve housing.
- a flow of compressed air can be switched between the outer connections via an internal valve seat arrangement, consisting of a closure element pressing against two concentric valve seats.
- the closure element is actuated axially against the force of a return spring.
- the closure element is actuated via a large-area control piston likewise arranged in the relay valve housing within a cavity.
- the control piston is acted upon by a control pressure for longitudinal adjustment, the control pressure being generated via a pilot valve arrangement.
- a pilot valve arrangement consisting of two electromagnetic valves, which is accommodated within the pilot valve housing, is used for setting and changing the control pressure.
- the first solenoid valve designed as an inlet valve is open when de-energized and communicates with a feed channel branched off from the feed pressure connection and with a working channel leading to the control chamber.
- the second solenoid valve which serves as an outlet valve, serves to vent the control chamber and is closed when de-energized.
- the outlet valve is likewise connected to the control chamber via its working line, whereas a connection to the atmosphere can be established via the ventilation connection on the relay valve housing via a coaxial ventilation duct on the exhaust side.
- the control pressure is changed by coordinated energization of the intake and exhaust valve. This change is made according to a pressure control.
- a pressure sensor is provided in the area of the working chamber to monitor the control pressure.
- control electronics to which the two solenoid valves of the pilot valve arrangement and also the pressure sensor are connected.
- a setpoint value for the control is provided by a remote central control unit of the compressed air braking system.
- electropneumatic control valve of the type described above is known, which in addition to an inlet and outlet valve feasible electrical control also enables auxiliary pneumatic control.
- a pneumatic two-circuit service brake circuit secures the auxiliary brake function if the electrical control fails and acts on the brake cylinders of all wheels via the electro-pneumatic control valve.
- Such a function is - as is generally known - realized via a backup valve provided in addition to the inlet and outlet valve of the pilot valve arrangement.
- the backup valve is connected to a control connection of the control valve on the supply side, whereas there is a connection to the control chamber on the work side.
- the backup valve is open when de-energized, the opening being caused by the power failure caused by a failure of the electrical control. In this state, the control pressure that can be released for the auxiliary brake function via the foot brake valve can reach the control chamber in order to actuate the control piston, i.e. to operate the brake.
- the backup valve is closed as a result of energizing the assigned coil by adjusting an internal movable armature, so that no control pressure assigned to the auxiliary brake function can get into the control chamber.
- the feed-side channel of the backup valve coaxially open into an internal valve chamber in such a way that the opposite movable armature is subjected to a central flow in order to guarantee that the backup valve will open in the event of an internal spring returning the armature breaking.
- opening cannot be ensured.
- the work-side channel of the backup valve is tils to be arranged off-center to allow the desired valve function in the prevailing space.
- this ducting which is implemented for safety reasons, causes a larger installation space adapted to it within the pilot valve housing in order to be able to accommodate the three valves belonging to the pilot valve arrangement.
- the outlet valve is to be arranged centrally within the pilot valve housing, since the ventilation duct leading away from it is to be led coaxially through the relay valve housing to the ventilation connection.
- the invention includes the technical teaching that the backup valve has a working channel arranged coaxially within a connecting element is connected to the edge region of the control chamber and, on the other hand, opens laterally into a valve chamber, and that a feed channel, which coaxially opens into the valve chamber on the one hand, can be supplied with the control compressed air via an opening provided on the connecting element outside radial, in order to provide the space required for the pilot valve arrangement through the channel guide rotated in this respect within the pilot valve housing.
- the advantage of the measure according to the invention is that now, taking into account the prevailing structural boundary conditions, an immediately adjacent arrangement of the backup valve next to the outlet valve is possible, as a result of which the width of the pilot valve housing can be reduced.
- the backup valve By moving the working channel of the backup valve, which opens into the control chamber, on the central axis of the backup valve, the backup valve can be arranged closer to the axis of the entire control valve.
- the inlet valve also has a working channel which runs coaxially within an associated connection element and opens into the edge region of the control chamber, whereas the feed channel opens laterally into a valve chamber.
- a further minimization of the installation space can be achieved by the ducting defined in this respect.
- FIG. 1 shows a longitudinal section through an electropneumatic control valve with a relay valve housing and a pilot valve housing
- FIG. 2 shows a top view of the control valve according to FIG. 1 of the pilot valve housing with the cover removed
- FIG. 3 shows a longitudinal section as a detailed view in the area of a backup valve.
- the electro-pneumatic control valve according to FIG. 1 has a two-part housing, which consists of a lower relay valve housing 1, which is connected to an upper pilot valve housing 2 via an intermediate sealing ring 3. The connection is made using a screw connection (not shown).
- the relay valve housing 1 and the pilot valve housing 2 enclose an internal control chamber 4, in which a control piston 5 is arranged to be axially movable.
- An electromagnetic pilot valve arrangement accommodated on the part of the pilot valve housing 2 is used for the axial adjustment of the control piston 5.
- the pilot valve arrangement comprises an inlet valve and a backup valve.
- the pilot valve arrangement is electrically controlled via an electronics unit 7 likewise arranged in the pilot valve housing 2.
- the electronics unit 7 is located below a cover 8 within the pilot valve housing 2.
- the outlet valve 6 shown vents the control chamber 4 when actuated, the exhaust air being discharged to the atmosphere via a coaxial ventilation channel 9.
- the inlet valve acts on the control chamber 4 with a control pressure in order to actuate the control piston 5.
- the control piston 5 moves a valve seat arrangement 10 via a lower, sleeve-like, coaxial formation.
- the compressed air flow is arranged between them on the relay valve housing 1 Brake line connection 11, on the one hand, and a feed pressure connection (not recognizable here), which is connected to an internal feed pressure chamber 12, and a bleed connection 13, on the other hand, can be switched.
- the vent connection 13 is additionally provided with a silencer 14.
- the muffler 14 ensures a reduction in the noise caused by the exhaust air flowing out.
- the electropneumatic control valve is shown here in its closed switching position.
- a corresponding opening of the valve seat arrangement 10 results in a flow, starting from the feed pressure chamber 12, to a working chamber 15, which opens at the brake line connection 11, around the brake pressure to increase as a result.
- the control piston is acted upon via a pilot valve arrangement, which is assigned to the pilot valve housing 2 and consists of the outlet valve 6, the inlet valve 16 and a backup valve 17.
- the outlet valve 6 is arranged centrally within the pilot valve housing 2 in such a way that its main axis runs coaxially with the main axis of the control valve, in which the ventilation channel (not shown here) runs.
- the inlet valve 16 is arranged adjacent to this.
- the inlet valve 16 has a coaxially arranged working channel that opens just into the edge area of the (not recognizable) control chamber.
- the same arrangement is also provided for the backup valve 17.
- the backup valve 17 consists of an electrical coil 18, via which a coaxial internal movable armature 19 can be axially adjusted.
- the movable armature 19 can be reset by means of a compression spring 20, so that in the normally open switching position shown, a closure element 21 embedded in the movable armature 19 does not come into contact with the corresponding valve seat 23 molded on by a coaxial connecting element 22.
- the compression spring 20 is housed within an internal valve chamber 24.
- connection element 22 is provided with a working channel 25 which, on the one hand, is connected to the valve chamber 24 in the edge region of the connection element 22 and, on the other hand, opens coaxially on the connection element 22, the escaping compressed air just opening into the outermost edge region of the control chamber (not shown here).
- control pressure is supplied via further valve-internal channel sections.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10120320A DE10120320B4 (de) | 2001-04-26 | 2001-04-26 | Vorgesteuertes Ventil mit einem Backupventil |
| DE10120320 | 2001-04-26 | ||
| PCT/EP2002/004631 WO2002087942A2 (de) | 2001-04-26 | 2002-04-26 | Vorgesteuertes ventil mit einem backupventil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1385725A1 true EP1385725A1 (de) | 2004-02-04 |
| EP1385725B1 EP1385725B1 (de) | 2009-02-18 |
Family
ID=7682704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02748677A Expired - Lifetime EP1385725B1 (de) | 2001-04-26 | 2002-04-26 | Vorgesteuertes ventil mit einem backupventil |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1385725B1 (de) |
| AT (1) | ATE423047T1 (de) |
| DE (2) | DE10120320B4 (de) |
| WO (1) | WO2002087942A2 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006017503B4 (de) | 2006-04-13 | 2022-12-01 | Zf Cv Systems Hannover Gmbh | Relaisventil |
| DE102006062974B3 (de) | 2006-04-13 | 2023-09-21 | Wabco Gmbh | Relaisventil |
| DE102008017852A1 (de) | 2008-04-09 | 2009-10-15 | Wabco Gmbh | Schaltmagnetventil |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3931761C2 (de) * | 1989-09-22 | 1993-12-02 | Knorr Bremse Ag | Elektro-pneumatisches Regelventil mit Relaisfunktion |
| DE4136244A1 (de) * | 1991-11-02 | 1993-05-06 | Wabco Standard Gmbh, 5300 Bonn, De | Relaisventileinrichtung |
| DE19605562A1 (de) * | 1996-02-15 | 1997-08-21 | Bosch Gmbh Robert | Druckregeleinrichtung |
| DE19609222A1 (de) * | 1996-03-09 | 1997-09-11 | Bosch Gmbh Robert | Anhängersteuerventil für eine Druckluftbremsanlage für Kraftfahrzeuge |
-
2001
- 2001-04-26 DE DE10120320A patent/DE10120320B4/de not_active Expired - Fee Related
-
2002
- 2002-04-26 AT AT02748677T patent/ATE423047T1/de not_active IP Right Cessation
- 2002-04-26 WO PCT/EP2002/004631 patent/WO2002087942A2/de not_active Ceased
- 2002-04-26 DE DE50213292T patent/DE50213292D1/de not_active Expired - Lifetime
- 2002-04-26 EP EP02748677A patent/EP1385725B1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE10120320A1 (de) | 2002-10-31 |
| DE50213292D1 (de) | 2009-04-02 |
| DE10120320B4 (de) | 2005-11-10 |
| EP1385725B1 (de) | 2009-02-18 |
| ATE423047T1 (de) | 2009-03-15 |
| WO2002087942A2 (de) | 2002-11-07 |
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